[Q] T-Mobile wifi calling on i747

My family recently switched to T-Mobile and another family member had my S3. I remember a loooong time ago I installed a i747 ROM that was a tmobile variant port and when I first booted with the rom it said something about tmobile wifi calling not working (because I'm on AT&T). If I wanted to get tmobiles wifi calling on my i747 S3 is there a method or rom that offers that? I tried searching for the rom I used before or a thread about this but I couldn't find one :l

My family recently switched to T-Mobile and another family member had my S3. I remember a loooong time ago I installed a i747 ROM that was a tmobile variant port and when I first booted with the rom it said something about tmobile wifi calling not working (because I'm on AT&T). If I wanted to get tmobiles wifi calling on my i747 S3 is there a method or rom that offers that? I tried searching for the rom I used before or a thread about this but I couldn't find one :l

I have i747 also and using it for T-Mobile. Did you make your wifi calling working? What ROM should I install to make it work?
Thank you.

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